| 川西新场须二段致密砂岩储层甜点类型及成因机制 |
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| 引用本文： | 赵俊威,陈恭洋,张玲,杨映涛,宋新新,王恒.川西新场须二段致密砂岩储层甜点类型及成因机制[J].地质论评,2024,70(1):123-136. |
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| 作者姓名： | 赵俊威 陈恭洋 张玲 杨映涛 宋新新 王恒 |
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| 作者单位： | 1) 长江大学油气资源与勘探技术教育部重点实验室，武汉，430100；2) 长江大学录井技术与工程研究院，湖北荆州，434020;3) 中石化西南油气分公司勘探开发研究院，成都，610000;4) 中国石油集团长城钻探工程有限公司地质研究院，辽宁盘锦，124010 |
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| 基金项目： | 本文为国家自然科学基金资助项目“海相浪控砂质临滨坝沉积构型差异性及沉积动力学机制研究”（编号：41902155）和“冲积扇储层孔隙结构复杂模态成因机制及其分布模式” (编号：41502126)的成果 |
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| 摘 要： | 川西新场地区上三叠统须家河组二段（须二段）天然气资源丰富，砂体大面积发育，储层孔渗较低，甜点成因复杂。为了阐明新场须二段甜点类型及成因，以岩芯观察、薄片分析、微米CT、阴极发光等多技术手段，在对储层岩石学、孔喉特征、有效裂缝特征等分析基础上，对甜点进行分类。新场须二段主要发育基质孔隙型、断缝型、层理缝型等3种甜点类型，不同类型甜点形成原因存在差异。强水动力条件下形成的高能分流河道、富石英砂岩是基质型甜点形成基础，在相对较弱的压实及胶结作用、较强的溶蚀作用下易形成基质型甜点；在靠近大型断层的基质孔渗较好部位易发育断缝型甜点；层理缝型甜点分布规模较小，不同类型层理界面处颗粒粒度、组分存在差异，发生差异成岩作用，形成力学薄弱面。新场须二段甜点发育受沉积、成岩及构造非均质性控制，对甜点类型的成因分析，有利于对甜点进行分类评价。
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| 关 键 词： | 川西坳陷 新场构造带 须家河组 须二段 致密砂岩气 甜点 |
| 收稿时间： | 2023/3/28 0:00:00 |
| 修稿时间： | 2023/6/27 0:00:00 |
The sweet spot types and genetic mechanism of tight sandstone reservoirs in the 2nd Member of Xujiahe Formation in Xinchang, western Sichuan Basin |
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| ZHAO Junwei,CHEN Gongyang,ZHANG Ling,YANG Yintao,SONG Xinxin,WANG Heng.The sweet spot types and genetic mechanism of tight sandstone reservoirs in the 2nd Member of Xujiahe Formation in Xinchang, western Sichuan Basin[J].Geological Review,2024,70(1):123-136. |
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| Authors: | ZHAO Junwei CHEN Gongyang ZHANG Ling YANG Yintao SONG Xinxin WANG Heng |
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| Institution: | 1) Key Laboratory of Oil and Gas Resources and Exploration Technology of Ministry of Education, Yangtze University, Wuhan, 430100;2) Mud Logging Technology and Engineering Research Institute, Yangtze University, Jingzhou, Hubei, 434020;3) Exploration and Development Research Institute, Southwest Oil and Gas Field Company, SINOPEC, Chengdu, 610000;4) Geology Research Institute, CNPC Greatwall Drilling Company, Panjin, Liaoning, 124010 |
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| Abstract: | The 2nd Member of Xujiahe Formation in Xinchang area of western Sichuan is rich in natural gas resources, with large area of sandbody, low reservoir porosity and permeability, and complex genesis of sweet spot. It is of great significance to clarify the type and genesis of sweet spot in the 2nd Member of Xujiahe Formation in Xinchang area. Methods: Based on the analysis of reservoir petrology, pore throat characteristics and effective fracture characteristics, sweet spot is classified by core observation, thin section analysis, micro CT, cathodoluminescence and other technical means. Results: There are three types of sweet spot in the 2nd Member of Xujiahe Formation in Xinchang, including matrix pore type, fracture type and bedding fracture type. The causes of different types of sweet spot are different. High- energy distributary channels are formed under strong hydrodynamic conditions, quartz- rich sandstones are the basis for matrix- type sweet spot formation, and matrix- type are easily formed under relatively weak compaction, cementation and strong dissolution. It is easy to develop fracture- type in the matrix with good porosity and permeability near large faults. The distribution scale of bedding fracture type is small, there are differences in particle size and composition at different types of bedding interfaces, resulting in differential diagenesis process, forming a mechanical weak surface. Conclusions: The development of sweet spot is controlled by sedimentation, diagenesis and structural heterogeneity in the Tx2 Member in Xinchang area. The genetic analysis of sweet spot type is conducive to the classification and evaluation of it. |
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| Keywords: | west Sichuan Depression Xinchang area Xujiahe Formation the 2nd Member of Xujiahe Formation tight sandstone gas sweet spot |
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